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1INTRODUCTION
1.1FEATURES1.2APPLICATIONS
1.3DESCRIPTION
HostSystem
SingleCellLi-Ion
BatteryPack
PACK-
PROTECTION
IC
CHG
DSG
Temp
Sense
Battery
Good
Current
Sense
I2C
T
LDO
PACK+
Voltage
Sense
Battery
Low
Warning
FETs
bq27500/1
RID
RID
Sense*
*bq27501Only
Power
Management
Controller
bq27500
bq27501
System-SideImpedanceTrack™FuelGauge
SLUS785–SEPTEMBER2007
•BatteryFuelGaugefor1-SeriesLi-Ion
•Smartphones
Applications
•PDAs
•ResidesonSystemMainBoard
•DigitalStillandVideoCameras
–WorkswithEmbeddedorRemovable
•HandheldTerminals
BatteryPacks
•MP3orMultimediaPlayers
•TwoVarieties
–bq27500:UsesPACK+,PACK-,andT
BatteryTerminals
–bq27501:IncludesBatteryPackIDResistor
(RID)Terminal
TheTexasInstrumentsbq27500/01System-Side
Li-IonBatteryFuelGaugeisamicro-controller
•Micro-ControllerPeripheralProvides:
peripheralthatprovidesfuelgaugingforsinglecell
–AccurateBatteryFuelGauging
Li-Ionbatterypacks.Thedevicerequireslittlesystem
–InternalTemperatureSensorforSystem
micro-controllerfirmwaredevelopment.The
TemperatureReporting
bq27500/01residesonthesystem’smainboard,and
–BatteryLowInterruptWarning
managesanembeddedbattery(non-removable)ora
–BatteryInsertionIndicator
removablebatterypack.
–BatteryIDDetection
–96bytesofNon-VolatileScratchPad
Thebq27500/01usesthepatentedImpedance
FLASH
Track™algorithmforfuelgauging,andprovides
informationsuchasremainingbatterycapacity
•BatteryFuelGaugeBasedonPatented
(mAh),state-of-charge(%),run-timetoempty(min.),
ImpedanceTrack™Technology
batteryvoltage(mV),andtemperature(°C).
–ModelstheBatteryDischargeCurvefor
AccurateTime-to-EmptyPredictions
Batteryfuelgaugingwiththebq27500requiresonly
–AutomaticallyAdjustsforBatteryAging,
PACK+(P+),PACK-(P-),andThermistor(T)
BatterySelfDischarge,and
connectionstoaremovablebatterypackor
Temperature/RateInefficiencies
embeddedbatterycircuit.Thebq27501workswith
–LowValueSenseResistor(10mΩorLess)
identificationresistorsinbatterypacks,togauge
•I
2
C™InterfaceforConnectiontoSystem
batteriesofdifferentfundamentalchemistriesand/or
Micro-ControllerPort
significantlydifferentratedcapacities.
•12-Pin2,5mm×4,0mmSONPackage
TYPICALAPPLICATION
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdocument.
ImpedanceTrackisatrademarkofTexasInstruments.
I
2
CisatrademarkofPhilipsElectronics.
UNLESSOTHERWISENOTEDthisdocumentcontains
Copyright©2007,TexasInstrumentsIncorporated
PRODUCTIONDATAinformationcurrentasofpublicationdate.
ProductsconformtospecificationsperthetermsofTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.